go/importer: fix build (disable tests that won't run on builders)
go/importer: fix build (disable tests that won't run on builders)

R=adonovan
TBR=adonovan
CC=golang-dev
https://codereview.appspot.com/43010043

t-yuki/go.tools.old,t-yuki/go.tools.old,t-yuki/go.tools.old